PHP Manual: Incrementally deflate data

string deflate_add ( resource $context , string $data [, int $flush_mode = ZLIB_SYNC_FLUSH ] )

Incrementally deflates data in the specified context.

context: A context created with deflate_init.
data: A chunk of data to compress.
flush_mode: One of ZLIB_BLOCK, ZLIB_NO_FLUSH, ZLIB_PARTIAL_FLUSH, ZLIB_SYNC_FLUSH (default), ZLIB_FULL_FLUSH, ZLIB_FINISH. Normally you will want to set ZLIB_NO_FLUSH to maximize compression, and ZLIB_FINISH to terminate with the last chunk of data. See the » zlib manual for a detailed description of these constants.

Returns a chunk of compressed data, or FALSE on failure.

If invalid arguments are given, an error of level E_WARNING is generated.

deflate_add